Multiple fuse plug



May 15, 1934. pFElFFER 1,959,250

MULTIPLE FUSE PLUG 'iled Oct. 17, 1933 INVENTOR ATTORNEYS Patented May 15, 1934 UNITED STATES PATENT OFFICE 2 Claims.

' all of which will be more fully hereinafter described and pointed out in the claims.

In the accompanying drawing;

Figure 1 is a view in longitudinal section;

Figure 2 is a view in transverse section on the line 2-2 of Figure 1;

Figure 3 is a view in transverse section on the line 33 of Figure 1;

Figure 4 is a fragmentary sectional elevation illustrating the spring ratchet arm and its contact with the fuses; and

Figure 5 is an end view on a somewhat reduced scale, the view constituting a top plan view of Figure 1.

1 represents the body of the plug which may be of hard rubber or any other suitable material,

and on the inner end of which the ordinary screw-threaded shell is fixed. It is, of course, desirable that this shell may be so fixed that it cannot turn on the body or the body turn on the shell, and with this idea in view I have provided angular projections 2 on the body and securely clamp the shell, which is ordinarily positioned thereon in split form, but there will be a secure bite or friction contact between the plug 2 and the shell to prevent independent turning movement of the parts.

The body 1 has a central core 3 in which a stem 4 is fixed. An enlarged ring 5 is snugly fitted over the outer end of the body 1 and bears against the end of the shell 2 so as to confine fuses 9 and prevent them from flashing out, as will more fully hereinafter appear. A head 6 appreciably smaller in diameter than the ring 5 will be rigidly secured on a projection '7 at the outer end of the stem 4, and this head 6 is located centrally in the ring 5, leaving an annular space 5 for the purpose which will hereinafter appear. The body 1 is provided in its periphery with a series of radial grooves 8, accommodating in each of the grooves a fuse 9. Each fuse 9 is bent in opposite directions at its respective ends, the lower end or feet 10 engaging the shell 2, and may be soldered or otherwise secured to the shell, if desired. The upper or outer bent ends 12 of the fuses are located in recesses 11, the recesses being deeper than the thickness of the fuse so that they provide shoulders 11. A spring arm 14 has a circular opening 15 at one end mounted to turn on projection '7 below the head 6 and against a shoulder 16 on the stem 4. The free end of this arm 14 carries a contact member 17 which constitutes both a ratchet pawl and an electric brush. This contact member 17 rides over the end of the body 1 and is caused to spring into the recesses 11 in contact with the arms 12 of each fuse, and with one of the shoulders 11 of the recesses 11 prevent retrograde movement of the arm, so that it constitutes a ratchet pawl permitting a free turning movement of the arm in one direction but absolutely prevents turning movement of the arm in the opposite direction.

An outwardly projecting pin 18 is fixed to the free end of the arm 14 and has a button 19 at its extremity. This pin 18 may be rotated manually in the recess or space 5' between the head 6 and the ring 5, so that by manually manipulating the button 19 any fuse may be included in the electric circuit.

I would call particular attention to the fact that the annular inner edge 20 of the head 6 is in a somewhat lower plane than the central portion of said head, so that it is in constant engagement with the spring arm 14 to effectually hold the contact member 17 in engagement with the fuse and there is sufiicient resiliency at the arm to allow the contact member to ride from one recess to another when the arm is moved in the proper direction.

The ring 5 at its outer face may be provided with numerals, as indicated in Figure 5, with which the button 19 registers, and these numerals correspond with the fuses so that the operator knows just which fuse is in electrical circuit. As the body 1, ring 5 and head 6 are preferably of hard rubber, they may be vu1 canized in their proper relationship as it is distinctly understood that none of these parts are movable when once assembled. It will also be noted that by reason of the arrangement above described the fuses are enclosed by means of the myself at liberty to make such changes and alterations as fairly fall within the spirit and scope of the claims.

What I claim is:

1. A multiple fuse plug including a body, a central stem fixedly mounted in the body and having'an extension at its outer end, a screwthreaded shell secured on the inner end of the body, a circular series of fuses supported in the body, said fuses projected at right angles at their ends, the inner ends of the fuses engaging the shell, said body having recesses receiving the outer ends of the fuses, the recesses being deeper than the thickness of the fuses, a spring arm mounted to turn on the stem, a fuse contacting member on the arm adapted to ride into and out of the recesses in the outer end of the body, the end walls of'the recesses permitting movement of the contact member and arm in one direction and preventing movement in the opposite direction, a ring secured around the outer end of the body and engaging the shell, and a circular head fixed to the stem and having its inner annular edge engaging the spring arm and holding the arm in position to ensure contact with a fuse.

2. A multiple fuse plug including a body, a circular series of fuses in the body, a ring secured around the outer end of the body, a circular head "fixed to the body located centrally within the ring and of appreciably less diameter than the ring so that a circular passage-way is provided around the head, a pivotally supported spring fuse contacting member under the head and engaging the head which insures contact of the spring contact member with respect to the fuses; and a button secured to the contact member and movable in the circular passage between the head and the ring to position the contacting member in engagement with the different fuses.

AUGUST PFEIFFER. 

